Malicious PDF — malware analysis report

Static analysis result for SHA-256 06dc46e815e2103c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-29 00:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6fce13ade054239be3e9797b77f88b02 SHA-1: de700996a0aef6f0a3bd0f795cf6e91e920159e6 SHA-256: 06dc46e815e2103c29752f5eed6742e10788810cfb5433c74c0135a47230c9ca
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded document body text, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but does not provide clear instructions or lures beyond the link farm's nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=yellow+crocus+book+club PDF link annotation
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/vavelejo_koberoduzutel_waxavasek.pdfIn PDF document text
    • https://nenizuve.weebly.com/uploads/1/3/4/6/134615173/duvetenedoroku.pdfIn PDF document text
    • https://pajixuga.weebly.com/uploads/1/3/2/3/132303126/a719a53993.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/sufabarasajep.pdfIn PDF document text
    • https://jolosusopafo.weebly.com/uploads/1/3/4/0/134097145/6334300.pdfIn PDF document text
    • http://bilkan.fun/feedback_sheet_creative_writingpnh6l.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/d84c46.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/carpal_tunnel_surgery_exercises.pdfIn PDF document text
    • http://demask.fun/986632658727hne7.pdfIn PDF document text
    • https://dopupuwupexiro.weebly.com/uploads/1/3/0/8/130813117/xevizirod-gixotatosi-wosuwoduxelewit-tilon.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/bisilamagume.pdfIn PDF document text
    • http://hermidkovo.info/blood_of_elves_audiobook_freengh6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55b00a2-3c3b-4a75-9fb7-a603a0286d85/guitar_songs_with_chords_and_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d22c7be7-69ee-40a4-98e3-2d6549ee0a10/dosadomabutavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a49f7b-fb67-485b-abeb-4817b7ce20e3/zataroronet.pdfIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_684507340c95404fa268260066a0c38d.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_52b718a9424444489f9cacc76b70afe2.pdf?index=trueIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_9b8917da36b5484a8d19834bd391878e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ef1e27-2ef6-4f94-a23a-eb3521edf7f0/zezitimigogowidatisuzam.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_8e33adbfa4864e7ca4955188aa12b391.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_11f454eabe2f44fa8e046d77f551bb5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa301b58-8919-4023-92f7-ce274c6e1288/zudixexerimawor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 4840 bytes
SHA-256: 52feead72bc65e2939ce2eaf48e53a5452222e40b7a56c25becabae6ef271c2d
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10972 bytes
SHA-256: 767b07972bb9a277903fa527eb4db1c09c41a2850d879b842125d36783c5acb5
font_02_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3